鋇鎢陰極的性能與多孔鎢結(jié)構(gòu)的關(guān)系
THE RELATIONS OF BARIUM-TUNGSTEN CATHODE PROPERTIES TO THE TUNGSTEN MATRIX STRUCTURE
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摘要: 本文對漬制鋇鎢陰極多孔鎢結(jié)構(gòu)與發(fā)射和蒸發(fā)性能的有關(guān)數(shù)據(jù)進(jìn)行了分析研究。結(jié)果表明,對于多孔鎢結(jié)構(gòu),鎢粉的顆粒度和孔隙的孔徑大小決定了小孔內(nèi)表面的總面積和鋇在鎢表面上的擴(kuò)散路程,鋇輸送通道的大小和長短。這些因素對鋇鎢陰極的性能和工作機(jī)理有密切關(guān)系,但僅用多孔鎢孔隙度來表征陰極性能那是不夠嚴(yán)格的。最后我們提出了對于不同用途的陰極應(yīng)采用的多孔鎢結(jié)構(gòu)。
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關(guān)鍵詞:
Abstract: Some data of emission and evaporation properties referring to the tungsten matrix structure of the impregnated cathode are analyzed. The results indicate that the particle size of tungsten powder and the pore size in the porous matrix determine the total inside surface area of all pores, the diffusion length of barium over the tungsten grain surface, and the diameter and length of path for the barium to transport through. These factors all relate to the properties and operation mechanism of an impregnated cathode; therefore, it would not be strictly right to employ only the matrix porosity for characterizing the cathode properties. Finally, the preferred structure of porous tungsten matrix depending on different applications of impregnated cathode is proposed. -
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